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Pennsylvania birdlife.

APA Citation

Luttringer, L. A., Pennsylvania Game Commission. (1970). Pennsylvania birdlife. 6th rev. and enlarged ed. Harrisburg: Pennsylvania Game Commission.

Luttringer, Leo A, and Pennsylvania Game Commission. Pennsylvania Birdlife. 6th rev. and enlarged ed. Harrisburg: Pennsylvania Game Commission, 1970.

Warning: These citations may not always be complete (especially for serials).